Download advanced color picker

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Configuration

You have to include 1 css, and 2 javascript files. This is done in your <HEAD> section with the following lines:
<link rel="stylesheet" href="js_color_picker_v2.css" media="screen">
<script type="text/javascript" src="color_functions.js"></script>
<script type="text/javascript" src="js_color_picker_v2.js"></script>

To assign the color picker to an image or a button, create an onclick event like this:
<input type="button" value="Color picker" onclick="showColorPicker(this,document.forms[0].rgb2)">